Final answer:
When ketchup prices rise, ketchup sellers increase their quantity supplied of ketchup due to the higher profitability. This is in accordance with the law of supply.
Step-by-step explanation:
In economics, when ketchup prices rise, ketchup sellers increase their quantity supplied of ketchup. This is because the higher price of ketchup makes it more profitable for sellers to produce and sell more ketchup.
According to the law of supply, as prices rise, the quantity supplied by producers increases.